Front portion of a humidifier tub inlet box seal



FIG. 1 is a front perspective view of a front portion of a humidifier tub inlet box seal according to my/our design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 has been removed from the specification.

Where included, broken lines showing environment or structure are for illustrative purposes only and form no part of the claimed design.

Where included, the use of stippling is intended to denote shading. 

The ornamental design for a front portion of a humidifier tub inlet box seal, as shown and described. 